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GETPGID(3P)                POSIX Programmer's Manual               GETPGID(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       getpgid - get the process group ID for a process

SYNOPSIS
       #include <unistd.h>

       pid_t getpgid(pid_t pid);


DESCRIPTION
       The  getpgid()  function  shall return the process group ID of the process whose process ID is equal to pid. If
       pid is equal to 0, getpgid() shall return the process group ID of the calling process.

RETURN VALUE
       Upon successful completion, getpgid() shall return a process group ID. Otherwise, it shall return (pid_t)-1 and
       set errno to indicate the error.

ERRORS
       The getpgid() function shall fail if:

       EPERM  The  process whose process ID is equal to pid is not in the same session as the calling process, and the
              implementation does not allow access to the process group ID of that process from the calling process.

       ESRCH  There is no process with a process ID equal to pid.


       The getpgid() function may fail if:

       EINVAL The value of the pid argument is invalid.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       exec(),  fork(),  getpgrp(),  getpid(),  getsid(),  setpgid(),  setsid(),  the  Base  Definitions   volume   of
       IEEE Std 1003.1-2001, <unistd.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  Issue  6,  Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The
       Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Stan-
       dard,  the  original  IEEE  and  The  Open Group Standard is the referee document. The original Standard can be
       obtained online at http://www.opengroup.org/unix/online.html .



IEEE/The Open Group                  2003                          GETPGID(3P)